在佛坪国家级自然保护区选取具有代表性的短柄枹栎林群落进行调查,采用空间序列代替时间变化的方法,划分年龄结构,编制静态生命表,绘制存活曲线和死亡率曲线,同时进行生存分析及谱分析,以揭示秦岭佛坪短柄枹栎种群的数量特征。结果显示:(1)佛坪自然保护区的短柄枹栎种群以中幼林为主体,老龄个体较少,种群年龄结构呈倒J型,属增长型种群。(2)短柄枹栎种群的死亡峰值出现在第Ⅰ龄级(胸径0~5cm)和第Ⅵ龄级(胸径25~30cm),生命期望在第Ⅱ龄级(胸径5~10cm)时达到最大;短柄枹栎种群存活曲线属于Deevey-Ⅱ型,可视为稳定种群。(3)短柄枹栎种群动态存在着周期性,基本周期较长,且大周期内存在小周期。研究表明,佛坪自然保护区短柄枹栎种群目前处于稳定增长的状态。
To explore the quantitative characteristics of Quercus glandulifera var.brevipetiolatapopulation in Foping National Reserve of Qinling Mountains,the age structure of the population was analyzed.A timespecific life table was constructed,then the survivorship curve and the mortality curve of the population were analyzed,and survival analysis and spectral method were subsequently conducted,which was based on the data from flied experiment and was carried out by means of space-for-time substitution.The results showed that:(1)There were abundant young and middle-age individuals in the population,while few old ones.The age structure of Q.glandulifera var.brevipetiolata showed reversed-J-shaped distribution and therefore it belongs to the growth type.(2)There were two peaks of mortality inⅠ(DBH 0-5cm)andⅥ(DBH 25-30cm)age classes.The life expectancy showed the highest value in Ⅱ(DBH 5-10cm)age class.The survivorship curve is the Deevey typeⅡ,which is indicated that the population was in a stable state.(3)The population dynamics showed periodic and the minor period coexist with the main period.The results suggest that Q.glanduliferavar.brevipetiolatapopulation showed a steady increase.